Study of Markarian 421 in the γ-ray energy range 30 - 100 TeV.

Details Study of Markarian 421 in the γ-ray energy range 30 - 100 TeV. Study of Markarian 421 in the γ-ray energy range 30 - 100 TeV.

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999nuphs..70..506g&link_type=abstract

Nuclear Physics B - Proceedings Supplements, vol. 70, issue 1-3, pp. 506-508

Physics

Nuclear Physics

1

Gamma-Ray Sources: Active Galactic Nuclei, Gamma-Ray Sources: Air Showers, Gamma-Ray Sources: Energy Spectra

Scientific paper

The active galactic nucleus Mrk 421 is studied through the EAS-TOP extensive air shower array in the γ-ray energy ranges 20 - 50 TeV and 80 - 120 TeV. No evidence of d.c. emission is found in both datasets. A straight power law extrapolation up to E0 ≍ 1015eV of the spectrum obtained from the observations by the EGRET and Whipple experiments - above 100 MeV and 0.5 TeV respectively - is excluded, as expected from the absorption of VHE γ-rays by the 2.7 K cosmic microwave background radiation. An indication of a steepening of the spectrum, with respect to such extrapolation, at γ-ray energies lower than expected from the 2.7 K cutoff is derived. This could be due either to a break in the source spectrum or to the absorption of VHE γ-rays by intergalactic infrared photons of wavelength ≍100 μm.

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